CVE-2025-59853: HCL DFXAnalytics Info Disclosure Flaw

CVE-2025-59853 Overview

CVE-2025-59853 is an improper error handling vulnerability in HCL DFXAnalytics. The application returns detailed stack traces in HTTP responses when errors occur. These traces expose internal application structure, code logic, and environment configurations to authenticated network users. The flaw maps to [CWE-209] Generation of Error Message Containing Sensitive Information. Confidentiality impact is limited and integrity and availability are unaffected, but the disclosed information assists attackers in mapping the application for follow-on attacks.

Critical Impact

Authenticated attackers can harvest stack traces from error responses to enumerate internal classes, file paths, library versions, and environment settings, supporting reconnaissance for chained exploitation.

Affected Products

• HCL DFXAnalytics

Discovery Timeline

• 2026-05-06 - CVE-2025-59853 published to NVD
• 2026-05-06 - Last updated in NVD database

Technical Details for CVE-2025-59853

Vulnerability Analysis

HCL DFXAnalytics returns verbose error responses when server-side exceptions occur. Instead of presenting a generic error page, the application serializes the full exception stack trace into the HTTP response body. An attacker who triggers a parsing error, type mismatch, or unhandled condition receives the class hierarchy, method names, line numbers, and contextual variables from the failure point.

This class of disclosure is categorized under [CWE-209]. The exposed data accelerates reconnaissance and lowers the cost of identifying further weaknesses, including library versions, dependency paths, and authentication or session-handling logic.

Exploitation requires network access and low-privilege authentication. Attack complexity is high because the attacker must craft inputs that reliably trigger unhandled exceptions across application endpoints.

Root Cause

The root cause is missing exception handling at the application boundary. The framework's default error renderer is not overridden with a sanitized handler. Unhandled exceptions propagate to the response writer, which serializes the exception object including its stack trace and any chained causes.

Attack Vector

A remote authenticated user submits malformed parameters, unexpected content types, or boundary-condition values to DFXAnalytics endpoints. The server raises an exception, and the response contains a stack trace describing the internal package structure and runtime context. The attacker iterates across endpoints to map the application surface.

No verified exploit code is publicly available for CVE-2025-59853. Refer to the HCL Software Knowledge Base Article for vendor-supplied technical detail.

Detection Methods for CVE-2025-59853

Indicators of Compromise

• HTTP responses from DFXAnalytics containing strings such as at java., Caused by:, Exception in thread, or framework package names like com.hcl. returned to clients.
• Repeated 5xx responses from a single authenticated session targeting multiple endpoints with malformed parameters.
• Web server access logs showing parameter fuzzing patterns followed by oversized response bodies.

Detection Strategies

• Inspect outbound HTTP responses at the reverse proxy or WAF for stack trace signatures and block or redact them before delivery.
• Correlate authenticated session activity with elevated rates of application exceptions logged server-side.
• Baseline normal error response sizes for DFXAnalytics endpoints and alert on outliers consistent with serialized exception payloads.

Monitoring Recommendations

• Forward DFXAnalytics application logs and web server logs to a centralized analytics platform for correlation across sessions and endpoints.
• Track repeated exception classes per user identity to surface reconnaissance behavior.
• Alert on response bodies exceeding expected error sizes from analytics endpoints.

How to Mitigate CVE-2025-59853

Immediate Actions Required

• Apply the remediation referenced in the HCL Software Knowledge Base Article.
• Restrict DFXAnalytics access to trusted networks and authenticated, least-privilege user roles until patched.
• Audit historical web server logs for evidence of stack trace exposure and rotate any secrets that may have been disclosed.

Patch Information

HCL has published guidance through its support portal. Consult the HCL Software Knowledge Base Article for the fixed release identifiers and upgrade procedure for HCL DFXAnalytics.

Workarounds

• Configure the application server or reverse proxy to replace exception responses with a generic error page before they reach clients.
• Disable debug or verbose error modes in DFXAnalytics configuration files and ensure production deployments run with minimal diagnostic output.
• Deploy a WAF rule that strips response bodies containing stack trace signatures from analytics endpoints.

# Configuration example - generic Nginx response sanitization
proxy_intercept_errors on;
error_page 500 502 503 504 /generic_error.html;
location = /generic_error.html {
    internal;
    return 500 "An internal error occurred. Reference ID: $request_id";
}